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Finding the Fourth Proportional to 1,458.72, 2,188.20 and 432.72

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Solution

The fourth proportional to 1,458.72, 2,188.20 and 432.72 is: 649.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,458.72 : 2,188.20 = 432.72 : x
  2. Step 2: Convert to fraction form
    1,458.72/2,188.20 = 432.72/x
  3. Step 3: Cross multiply
    1,458.72x = 2,188.20 × 432.72
  4. Step 4: Simplify right side
    1,458.72x = 946,877.90
  5. Step 5: Solve for x
    x = 946,877.90/1,458.72
  6. Step 6: Final answer
    x = 649.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.